Stop-motion for pile-weaving machines



Sept. 9, 1952 KAHN STOP-MOTION FOR PILE-WEAVING MACHINES 4 Sheets-Sheet1 Filed Dec. 30, 1949 FIG. I

INVENTOR. BfNJAN/N IMHN A TI'ORNf Y Sept. 9, 1952 B. KAHN 2,609,847

STOP-MOTION FOR FILE-WEAVING MACHINES Filed Dec. 50, 1949 4,Sheets-Sheet2 2/0 FIG- 2 20 0.9

T /4 I46 226 06 I i 14/ 202 4 3 a 54 J00 INVENTOR.

200 BENJAMIN KAHN F/ G. If ATTORNEY Sept. 9, 1 B. KAHN $TOP-MOTION FORFILE-WEAVING MACHINES Filed Dec. 30, 1949 4 Sheets-Sheet 5 N M a o R wmt v 2k w mw fiir WiIMII m gm 0 m W Q -31 6M1 5 ST W w .1 M w B +3 w W LIIIHIIIIIIIIIIUMH, 1 1 H QR NM 3.. mmn\%\w 5m mmm 3m NW, v w n3 1 -il!gw ut EN 3% A TTOR/VE Y Sept. 9, 1952 KAHN 2,609,847

STOP-MOTION FOR PILE-WEAVING MACHINES BfNJAMl/V I01 HN ATTOR/Vf)Patented Sept. 9, 1952 STOP-MOTION FOR PILE-WEAVING MACHINES BenjaminKahn, Gadsden, Ala.

Application December 30, 1949, SerialNo.'135,877

The present invention relates to stop-motion 8 Claims. (01. 139-336)arrangements for looms adapted to weave terry or cut pile fabrics.

In my co-pending application Ser. No. 123,545 and which is now PatentNumber 2,547,824, dated] April 3, 1951, filed October 26, 1949, I havedisclosed a loom type machine of the character set forth above in whicha reciprocable carriage, carrying a set of hooks, is periodicallydisplaced from an inoperative into a thread engaging position in'whichthe hooks engage certain warp threads to draw them into loops, thelatter being then firmly anchored in the fabric by oneor more traversesof the shuttle occurring while the carriage is retracted in inoperativeposition. In the particular form of machine disclosed, the carriage isnormally held in its inoperative position by a retainingmechanism'controlled in suitable manner, e. g. from a dobbyeoperatedharness lever, so as to, become momentarily inoperative in timedrelationship with the movements of the lay or batten so that, duringcertain reciproca' tions of the lay, the carriage is enabled to. carryout a similar reciprocatory movement at the end of which it returns toits inoperative position.

In the prolonged operation of a machine of 1 this character it mayhappen that, owing to wear.

andv tear, failure of lubrication or other causes resulting in theaccidental jamming of some part,

the retaining mechanism fails to respond prop-' erly to the operation ofthe controller and does not disengage the carriage. In such a case oneor more rows of loops will be omitted in the pattern tobe weaved and,unless the irregularity is noticed immediately, a considerable amount oftime and material may go to waste.

It'is, therefore, a primary object of the present invention to.provide,in a machine of the character described, means for arresting the machinewhenever the sequence of operations referred to above is not properlycarried out.

More generally, however, it is an object of this invention to provide,in a loom or related machine, means for stopping its motion (or givingany other desired indication) whenever a first movement, executed by acontrol mechanism, is not followed in due time by a second movement,executed by a follower mechanism, which is to occur before the movementof the control mechanism has been completed.

The invention will be described with reference.

to the accompanying drawing in which:

Fig. l is a. view similar to Fig. 2 of my aboveidentified application,representing a side-elevation of a loom provided with a stop-motion 2arrangementaccording to the present invention, parts of the loom framehaving been removed to expose the principal elements .ofxthe machine;Fig. 2 is a top plan view, on alarger:scale,l of

some of the elements shown in Fig. 1 h

Fig. 3 is a side view on the? line 3-3 "of Fig. 2;. Fig. 4 is a sideelevation of oneof theswitchi'ng'ij devices forming part of thestop-motion arrange ment according, to the invention;

Fig. 5is atop plan view of the device'shownin" Fig. 4; i

Fig. 6 is an end view of the device illustrated" in Figs. 4 and 5,shown'in' normal or 'unoperated position;

Fi '7 isa View similar to Fig; 6, showingiithe device in oif-normalorjoperated position;

Fig. 8 is a side elevation. of another switching.

device forming part of the'stop-motion arrangement;

Fig. 9 is an elevation of the same device taken;

from the side opposite that of. Fig. 8; showing the device in cit-normalor operated position; i

Fig. 10 is a View similar to Fig. 9, showing the device in normal orunoperated position;

Fig. 11 is an end view of the device taken on the line I l--H of Fig.10;

Fig. 12 is'a top view of the device in the osi-l tion shown in Fig. 9;

Fig. 13 is a circuit diagram illustrati ngthe electrical connectionbetween the devices of 4-7 and 8-43, respectively; and

Fig. 14 is agraph showing the operation of-tliel two devices in timedrelation to that of. other parts of the machine.

Referring first to Figs. 1-3, there is shown a machine 20 comprising aframe 2| whereon. are supported the various elements of conventionalhorizontal loom of the Northrop type, including the warp beam 22, thetake-up roll 23, guide? rollers 24, 25,16, the 1ay 21 pivoted at 28, aset of dobbies (not shown) selectively controlling the 1 movement ofvarious harnesses suchas shown at 31a, 3 lb, 3 [0 by way of wires 33a,33b, 33c, respec tively, which pass over'rollers 34a, 34b; 34c andbecause well known per se. Fillings after having been turned into afabric 38, around deflection roller III, guide roller 28 and deflectionroller II2 to the take-up roll 23.

Secured to the frame 2! adjacent the ends of its breast beam are a pairof slide boxes or guides 4I, I4I within which move the slides 43, I43,respectively. Fig. 1 only shows the assembly 4I, I4I positioned to theleft of the operator (who stands at the right-hand end of the machine asviewed in Fig. 1), the other slide box and slide, positioned to theright of the operator, being illustrated in Figs. 2 and 3. Each slidecarries at its front end a bracket 45, I45, respectively, serving as ananchorage for a respective pair of springs such as 46, I48, I41, thesesprings having their other ends anchored to pins such as 48, I48, I49projecting from the boxes 4I, MI. The tendency of these springs is todisplace the slides rearwardly from the position shown in the variousfigures.

Each slide is provided at the underside of its rear extremity with a setof sawteeth 59, I59 cooperating with a dog 5!, I5I, respectively, thedog being pivoted to the associated slide box as shown at I52 for thedog I5I. A vertical rod 54, I54, slidably guided in a sleeve such as 53which is secured to the frame 2|, is aligned with the rear extremity ofthe respective dog and has its lower end pivoted to a lever such as 55,rotatably held in the frame 2I by a stud 58. A spring 51, anchored tothe frame 2I at 32, tends to maintain the left-hand end of lever 55 (asviewed in Fig. l) and, with it, the rod 54 in a raised position in whichthe top of the rod abuts the dog 5|, thereby positively maintaining thelatter engaged with a pair of teeth 59 after the slide 43, in a mannersubsequently described, has been brought into the position illustratedagainst the action of its springs; it will be understood that anidentical arrangement, not shown, holds the rod I54 in the raisedposition shown in full lines in Fig. 3, thereby also maintaining the dogI5I engaged with a pair of teeth I59. 7

The two rods 54, I54 are adapted to be periodically depressed, againstthe action of spring 51 and its companion spring (not shown) associatedwith rod I54, by means of cams such as 6I which are mounted on a shaft89 and co-operate with lever 55 and its companion lever. not shown.Motion is imparted to the shaft 69 by means of a cylinder or pulley 64fixed to the shaft and having the end of a wire 86 wrapped around it,this wire passing around a guide roller 67 as well as a guide roller 58and being fixed to a special dobby-operated harness lever or similartiming means, not shown, so as to be tensioned at predeterminedintervals. A torsion spring 59, wrapped around the shaft 60 and fixedthereto at one end, is anchored to the frame M at 63 and tends torestore the cams to the position illustrated in Fig. 1 after they havebeen displaced therefrom by the action of wire 66 to effect the descentof rods 54, I54.

Bridged across the rear ends of the two slides 43, I43 are a pair ofparallel beams 63, 59 which together with these slides form a reciprocalcarriage generally indicated at 15. The inner or rear one of these twobeams, beam 69, carries a hook bar I0; each slide further carries at itsrear end a lug II, III, respectively, these lugs forming an abutment fora pair of plates such as I2 mounted on the forward face of the layadjacent the two ends thereof. The positions of these lugs on theirslides are adjustable by .The threads 990, which may be somewhat heavierthan the ground warp 99a, 99b and which are supplied by separate spoolsor the like, not shown, enter between the feed roller 83 and the presserroller 84, thence pass around rollers I8 and TI which cause them totravel along a short horizontal run in which they traverse the eyes ofindividual riders I8, and after passing around roller 85 and guide rails89 enter the heddles of harness 3Ic. These threads, therefore, form partof the shed 99 previously referred to.

The riders I8 form part of a stop-motion arrangement for the pile warpwhich does not form part of the present invention and has been describedin detail in my above-identified application.

Mounted on the shaft 9| of feed roller 93 is a gear 92 which meshes withanother gear 93 mounted on a stud shaft 94. A plate 95, loosely pivotedon the stud shaft 94, carries a pawl 96 which is pivoted to the plate at91. Pawl 98 co-operates with a ratchet 98, fixed to the stud shaft 94 soas to be rigid with gear 93, and is held in contact with the teeth ofthe ratchet by means of a spring (not shown). The end of roller 83opposite gear 92 is embraced by the jaws of a brake member 80 which ispivoted to the frame 2| at 88 and frictionally engages the roller 83 toprevent overrunning and maintain the threads 990 at a certain tension.

Pivotally secured at IIlI to the plate 95 is a bent rod I09 having itsother extremity fixed by a nut I93 to an upstanding portion of bracket45. Forward displacement of the slide 43, resulting in a movement of rodI toward the right asviewed in Fig. 1, will thus swing the platecounterclockwise around the stud shaft 94, thereby imparting a similarmovement to the ratchet 98 and the gear 93, this in turn resulting in aclockwise rotation of gear 92 and roller 83.

The hook bar I9 carries a set of hooks I95 each having a shank I95through which pass the mounting bolts I97 securing the hooks to the bar;each hook also has a bill I98, lying in the plane of the shank I99, anda fin-shaped part I89 extending perpendicular to that plane, all asclearly seen in Figs. 2 and 3. It should be noted that this form ofhooks is shown merely by way of illustration and that they ma bereplaced, for example, with any of the hooks disclosed in my co-pendingapplication Ser. No. 129,573, filed November 26, 1949.

The operation of the mechanism so far described is as follows:

Let us assume that, after the formation of shed 99 and the insertion ofa filling I III in the usual manner, the lay 27 has just moved into itsforward (vertical) position indicated in dot-dash lines in Fig. 1. Thismovement of the lay causes the plate I2 and its companion plate, notshown, to impinge upon the lugs II, III, respectively, an action whichslightly displaces the carriage I5 toward the front and momentarilyrelease the dogs 5I, I5I from the grip of teeth 50, I59. Owingtether-presence; f1.I'Qd$;54';.x|54, however;; these ddgszwillfremainzir'r: the position showncin: Figs; 1 and;:.3,-;.whereupomtheilay returns to itsyposition shown", infull :lines 1hr:E'ig..: .1. This cycle; therefore, constitutes the. ordinary:weavinguoperation in: whichamwett thread ;is.s thrown. across raised.and: lowered: warp; threads. which .2 includes: the.

During; a; subsequent cycles of operation, in which theeharness. 3l"ccwi l=l' "be:inrraisedtpositiomi the :pile warpv threads? 90c: will;have i been positioned in the-paths of movement-oi respective" hooksI05. Let us assume that in this particular cycle a..roweofloopscare. to.be. formed; Anshort time'wbefore pthe lay 2 1:: again :reachesritsivertical position-,c. the. controhnrechanism: including wirefifigsshafitzBU; cam 16 t randlever fiirwillhavei caused the: rods .54;.1 5'4 toodescendi into .the: position indicated'. in dot-dash: linesforithe: rods] 5.4 (Fig.::3)..

Whenenow; the lay-again strikes th'e'lugs 1 I, [11,.

the dogs 5|, IE! will be: released anchibystheinowna weight; willdropinto the;position:showniimdotdash: lines forthe: dog:.l M (Fig.3?).Lin which they IESt SOIILrtOD Ofi their; respective rods; Now; as

the-laycrecedes,-. thevcarriage. T151Wi11 *follow it on.

time-the-Wire: 6 Bhasbeen released. and: the torsion spring 59hasrestored" the cams. on shaft'ifiil to the position of Fig. 1.. When,therefore, thecarriagesl5ihasrarrived in its forward: positionspring 5Tfanditsxcompanion spring: cause the. rods 54,. l Eltoiorcethe dogs. 51:,I 51 *into. engagement with the-teeth; oftheir; respectivexsli'des; so.thatithe.

carriage .15 will be retainedqin::thatiposition: duringfthefollowing.cycle or cycles-of:operatiorrduring whichathe:loops.;.previously formedwill be firmlyanchored to the. body of the fabric...

When the carriage flirfirst. followed the lay- 2;?

on its. rearwardiswing, the. rod l00iwas displaced.

in such; a sense:..asr to: cause (the .pawl .96: to. pass over a; numberof teeth;:of ratchet"98;" thisnumher being preferably: adjustable by'varying. the

distance of :the .pivot' [0i .from theshait .94: On the... restoring:(forward) movement of :the. car'- riage;.during; which the: loops are@form-ed;.the' rod:

lllfl isiwithdrawn and rotates the .plate. 951m such asense..that:the..paw196= Wil1 d-isplace the elements 98, 1 93; 92 and83.byan' angledetermined bythe numberzof .ratchetteeth previouslyskipped; thereby imparting th'e'desired slack to the threads 900; Theamount: of thisslackshouldwbe rogue latedgini accordance with the lengthof :the loops,-

the latter being adjustable b changing theposi' tion ofithe lugs Hynlontheislides 43,- M3.

The: problem whichl have setout to-solve by. my present .lIlVEIltiOIL ishow to stop: the machine ortin some 110171181? manner attract theattention of theioperatorr'it; if ;for:some-reason; the car-;riage-"ISE-iails to leave its: forward position. :after the rodsidg I54have disengaged the dogsS-t, 151. For thispurpose-I provide a pai-rofswitching devices; generallyindicated at200 and-300;w-hich are"respectively controlled by thecarriage I5 (formingpart of the followermechanism) andby the control mechanism previously referred to Intheparticular-embodiment illustrated; device 200 (Figs.l.2, 3)co-operates with the slide i lt while device 300.. responds to theoperation. of .rod 54. Device. 200 issecured. to. the. slide box MI byan arm, 20! whilevdevice;.300:-ismounteddirectlnom the frame 21 adjacentthe rod 54. 1

Referring to. 3 Figs. 2&7 for. a: detailed descripe;

tion of the .switchi2i00g1 it i will be noted. thatithee lattercomprises: a. vertical supporting-plate 12021 attached, by meansaofscrews. 203, to. the armr20l .2

An inclined. arm 204 extends: upwards. from the; plate 202. and iroms.arest .for the horizontalwlegzc of an. angle. memberr205a. which is:urged by; 3,? spring .206, secured to. thewplate 2021 by auscrew:

2 01,: toward the armi20 l, this: member beingpiw oted to plate 202.at208 The: vertical leglof meme ber'2051has insul'atedly mounted'thereon amay-:-

able contact blade 209 which cooperates with a similar,.stationary blade2 l0,tthe.1atter beingirr sulatedly secured: to. a vertical. arm 2| Iextending i from: theplate 202. As clearly seen' in Fig.4, blade 209: isheld onstheimember 205 by means of a bolt 2 l 2'," insulated from theblade by a. dielectric sleeve" 213, and is clamped between a pair ofinsulating washers 214, 215; Similarly, the .blade 210i is clampedbetween washers Z [6; 2| l' byameans of a bolt 2 i8.

Suitableuterminal .1 tags 219; 220 areprovided on thelextremities ofblades 208; 210, respectively,

to which are connected the ends of leadsor wires The pivot 208ifor themember 2.05 is represented by alrod which anchored in two short lugs223g 224. risingfromthe plate 202. The extremity of rod' 2 08 loppositeangle member 205 carries "a nor-- mally horizontal arm 225, extendingparallel to the horizontal leg of member 205; andbothcf" thesehorizontal elements support a cam bar-226 extending paralleLtothe rod:208;: It willbenoted from Fig. '7 that the blades 209, 210, which-arenormally in conductive contact with each-other,

cantbe separated: by a raising of cam bar'226 whichxcauses anglemember-205 to rotate about" the rod 208. against theaction: ofits'restori'ng' ner previously described-the pin229-engagesthe curvedforward extremity 230 of cam-bar 226; thereby raising thelatter'asillustrated iii-Figs: 3

and From Fig. 3, wherethe pin 229 has been shown in dot-dash lines inits extreme'rearward' position, it will be noted that the bar- 226 is"long' enough to stay raised -as-1ong as the-pin isoff normal, sethatthe contacts 209; ZI-Owiliremain open until the carriage ha-s ret-urnedto its inop erative=positiont Turning now-t0 Figs. 8 -12-for adescription of device:30lJ;-it will be-seen that a body-memberiifll,secured by screw. 302" to the frame 21, carries a fixedhorizontal-contact arm 3 03' and a movable" contact arm 304 pivoted tothe member 30'i at 305; Pivoted to the fixed arm 30s at one is swingablelever-30 provided at itslower extremity with a transversebar 308; thelatt'er'formingjan.

abutment-forthelay'2'! (seeFigs; l and 10).

Each of the arms 303', 304. carries a respective contactblade 309,. 31 0which are normally out of engagement with each other, corresponding tothe.

position of arm w t-illustrated in. Figs. 8;. 10 and 11.

This position. of the. movable arm 304* isw. brought about by'the lay21which,:engagingthei.

bar 308, causes the upper extremity of lever 30? to coact with thecam-shaped underside 3!! of arms 304 111 such a manner that the latterwill be swung clockwise, as viewed in Figs. 9 and 10, if the contactshad previously been in the closed position shown in Figs. 1, 9 and '12.Arm 334 is provided with a boss 312 co-operating with a spring-pressedpin 313, lodged in a bore 3M of body 33!, to index the arm 3% either inits opencircuitor in its closed-circuit position; the bore 314accommodates. the spring 313 which is held in position by a threadedplug 3w. A spring 351, anchored to the 'member'3fll at 3&3, passesaround the pivot 305 and engages the lever 33? to urge the latter intoits normal position, shown in full lines in the several views, afterdisplacement thereof by the lay 2? into the position indicated indot-dash lines in Fig. 10, which displacement serves totrip the arm 3%into its open-circuit position.

Each of the contact blades 339, 3E3 is provided with a respective tag3|9, 323 to which the leads or wires 32l, 322 are connected. The bladesare fastened to these arms in insulated relationship,

in similar manner to that described for the blade 209, by means of bolts323 and 324, respectively, and washers 325, 326 and 321, 323,respectively.

The rear end of arm 334 is recessed to form a shoulder 329 against whichabuts the forward face of a spur member 339, the latter being pivoted tothe arm 394 at 33l and normally held in contact with the shoulder 329 bya spring 332 which embraces a stud 333 on the arm 3%. The spur portionof this member extends into the path of a collar 333,-secured to the rod54, which is normally above the arm 3% as shown in Fig. 1 and in fulllines in Fig. 10. When this collar descends with the rod ti l into theposition shown in dot-dash lines in 10, it will displace the spur member330 against the action of the relatively weak spring 332 withoutdisplacing the arm 304 from its normal position in which it is held bythe coaction between pin 3 l 3 and boss 3 i 2. On the subsequent rise ofthe rod 33, however, the collar 334 engages the spur member 333 frombelow, causing it to bear upon the shoulder 329 and thereby effecting arotation of the arm 36 3 into its alternative position in which itscontact blade 3H3 touches the stationary blade 333, thus closing acircuit Which is not opened until the lay 21 displaces the lever 33? inthe manner previously described.

As illustrated in the circuit diagram of Fig. 13, the contacts 233, 2Mand 3539, 3H1 are connected in series with each other and with thewinding of a relay 335. Motor 35 is energized from a main power supply336 in a circuit which includes break contacts 337 of relay 335, theenergizing circuit for the motor including anauxiliary source of current338 as well as the leads 222i, 222, 32! and 322. Thus it will be seenthat simultaneous closure of both sets of contacts will cause the relay335 to operate, breaking the energizing circuit of motor 35 andarresting the machine.

Turning to the timing diagram of Fig. 14, curve 2'! denotes thereciprocations of the lay (upper peaks indicate forward position), curve'15 denotes in similar manner the displacement of the carriage by and instep with the lay, curve 53 denotes the rise and fall of rod 53, curve360 indicates the periods of closure of contacts 339, cm and curve 233similarly indicates the period of closure of contacts 253, 2H3; finallycurve 335 denotes the operation of the relay of Fig. 13. Several cyclesof operation are indicated by the intervals A, B, C, D and E. Thus,

in the interval B, there occurs a normal operation of the loop formingmechanism, initiated by a descent of rod 54, followed by a movement ofthe carriage (the striking of the carriage by the lay during each cyclebeing represented by the low peaks '15) which causes the switch 20!] toopen before the switch 398 closes its contacts,

' and ending with the re-opening of switch coning in the energization ofthe relay 335. The circuit of motor is now opened at contacts 331 andthe machine comes to a stop.

It should be understood that the invention is by no means limited toprecise form or mode of application described and illustrated; on thecontrary, it is capable-of numerous modifications and adaptations aswell as use with other types of machinery Without departing from thescope and spirit of the invention as defined in the objects and in theappended claims.

I claim:

1. In a loom, in combination, a reciprocable lay, a reciproca blecarriage, retaining means normally holding said carriage in aninoperative position remote from said lay, control means periodicallyinactivating said retaining means in timed relationship with themovement of said lay, operating means effective upon inactivation ofsaid retaining means to displace said carriage in the direction towardsaid lay to an operative position, return means including the layeffective upon displacement of said carriage to return the latter tosaid inoperative position, a first switching device actuated by saidcarriage to assume an ofi-normal position as long as said carriage isdisplaced from its'said inoperative position, a second switching deviceactuated by said control means to assume an off-normal positionsubsequently to the beginning of the normal displacement of saidcarriage, restoring means operative prior to the normal return of saidcarriage into said inoperative position to restore said second switchingdevice to its normal posi tion, a motor controlling the movement of saidlay, and circuit means for stopping said motor, said circuit means beingrendered efiective only in the normal position of said first switchingdevice upon said second switching device simultaneously occupying itssaid elf-normal position.

2. The combination according to claim 1' wherein said control meansincludes a control member moving in one direction to inactivate saidretaining means and subsequently moving in the opposite direction toreturn said retaining means to the active position thereof prior to thereturn of said carriage to said inoperative position, said controlmember displacing said second switching device toward said off-normalposition thereof upon moving in said opposite direction only.

3. The combination according to claim 2 wherein said control membercomprises a rod provided with an abutment, said second switching devicecomprising a movable arm provided with an extension displaceablerelative to said arm, spring means tending to maintain'said exr tensionin a predetermined position relative to said arm, said extension in saidpredetermined position projecting into the path of said abutment, andstop means limiting displacement of said extension relative to said armin the direction induced by movement of said rod in the direction of thelatter for returning said retain ing means to its active position.

4. The combination according to claim 3 wherein said movable arm carriesa first contact element, said second switching device further comprisinga second, stationary contact element engaging said first contact elementonly in said off-normal position of said second switching device.

5. The combination according to claim 1 wherein said first switchingdevice comprises a movable arm, said carriage being provided with cammeans displacing said movable arm upon displacement of said carriagefrom its inoperative position.

6. The combination according to claim 5 wherein said movable arm carriesa first contact element, said first switching device further comprisinga second, stationary contact element engaging said first contact elementonly in the normal position of said first switching device.

7. The combination according to claim 1 wherein said restoring means isactuated by said lay.

8. In a loom, in combination, a reciprocable movement of said carriagetoward operative position, restoring means operative prior to the normalreturn of said carriage to its inoperative position to restore saidsecond switch to open condition, a motor controlling the movement ofsaid lay, and circuit means for stopping said motor, said circuit meansbeing rendered effective only when said first and second switches aresimultaneously closed.

* BENJAMIN KAHN.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 905,131 Bacon Dec. 1, 19081,812,206 Hindle et a1 "June 30, 1931 2,499,887 Sullivan et al on Mar.'7, 1950

